/*******************************************************************************************
 * Copyright (c) 2006-2009 Alex Robson, Rob Simmons, Craig Israel, and Rachel Twyford
 *
 * Use of this software in any form requires that you have both 
 * read and agreed to the following terms:
 *
 * Permission is hereby granted, free of charge, to any person obtaining
 * a copy of this software and associated documentation files (the "Software"), 
 * to deal in the Software without restriction, including without limitation 
 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions: 
 *
 * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 * Redistributions in binary form must reproduce the above copyright notice, 
 * this list of conditions and the following disclaimer in the 
 * documentation and/or other materials provided with the distribution.
 * Neither the name of Nvigorate nor the names of its contributors may 
 * be used to endorse or promote products derived from this software without 
 * specific prior written permission. 
 *
 * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 
 * DISCLAIMED. IN NO EVENT SHALL ANY CONTRIBUTOR BE LIABLE FOR ANY
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 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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using System;
using System.Linq;
using System.Reflection;
using Nvigorate.Common;
using Nvigorate.Logging;
using PostSharp.Extensibility;
using PostSharp.Laos;

namespace Nvigorate.Aspect
{
    /// <summary>
    /// Adds LogManager exception logging aspect to every function in a class that this attribute
    /// is applied to. This should only be used sparingly and is generally not robust enough an
    /// approach.
    /// </summary>
    [MulticastAttributeUsage(MulticastTargets.Class | MulticastTargets.Method)]
    public class LoggingAspect : CompoundAspect
    {
        private bool _rethrow = true;

        public override void ProvideAspects(object element, LaosReflectionAspectCollection collection)
        {
            if(element is MethodInfo)
            {
                var method = element as MethodInfo;
                AddAspectToMethod(method.DeclaringType, method, collection);
            }
            else
            {
                Type targetType = element as Type;
                targetType
                    .GetMethods(BindingFlags.Public | BindingFlags.NonPublic)
                    .ToList()
                    .ForEach(method => AddAspectToMethod(targetType, method, collection));    
            }
        }

        private void AddAspectToMethod(Type targetType, MethodInfo method, LaosReflectionAspectCollection collection)
        {
            if(!method.Name.Contains("get_") && !method.Name.Contains("set_") &&
               !method.DeclaringType.Equals(typeof(object)))
            {
                //Writes a line to the console during build to make it easier to determine join points for the aspect
                Console.WriteLine("Applying log manager logging aspect to method {0} on type {1}", method.Name, targetType.FullName);
                collection.AddAspect(method, _rethrow ? (OnMethodBoundaryAspect)new LogManagerReThrowAdvice() : (OnMethodBoundaryAspect) new LogManagerNoThrowAdvice());
            }
        }

        [Serializable]
        public class LogManagerNoThrowAdvice : OnMethodBoundaryAspect
        {
          public override void OnException(MethodExecutionEventArgs eventArgs)
            {
                LogManager.LogError(eventArgs.Exception, Severities.Moderate);
            }
        }

        [Serializable]
        public class LogManagerReThrowAdvice : OnMethodBoundaryAspect
        {
            public override void OnException(MethodExecutionEventArgs eventArgs)
            {
                LogManager.LogError(eventArgs.Exception, Severities.Moderate);
                base.OnException(eventArgs);
            }
        }

        public LoggingAspect(bool rethrowException)
        {
            _rethrow = rethrowException;
        }
    }
}
